How come "being" was used not just "are" or anything else? How can I understand this sentence grammatically?
The speaker here omits "are" before "being" because she is talking in a shortened way, which is how news anchors speak in the United States. You can think of this type of sentence as the news anchor reading a headline. In conversational English, you would say "Plastic straws are being phased out at Starbucks."
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